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a
increase in BOD and DO
b
decrease in BOD and DO
c
decrease in BOD and increase in DO
d
increase in BOD and decrease in DO
answer is D.
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Detailed Solution
Micro-organisms involved in biodegradation of organic matter in the sewage body consume a lot of oxygen. This results in an increase in BOD and a sharp decline in dissolved oxygen (DO) downstream from the point of sewage discharge.